Place the following elements in order of decreasing atomic ...

[ereecah]

Place the following elements in order of decreasing atomic radius. Xe Rb Ar
 
  A) Ar > Xe > Rb
  B) Xe > Rb > Ar
  C) Ar > Rb > Xe
  D) Rb > Xe > Ar
  E) Rb > Ar > Xe

Question 2

A mixture of N2, O2 and Ar has mole fractions of 0.25, 0.65, and 0.10, respectively. What is the pressure of N2 if the total pressure of the mixture is 3.9 atm?
 
  A) 2.5 atm
  B) 0.39 atm
  C) 0.67 atm
  D) 0.98 atm
  E) 1.33 atm

[ms_sulzle]

Answer to Question 1

D

Answer to Question 2

D

[ereecah]

Thank you!

[ms_sulzle]

Always glad to help...